Analog Devices ADV8005, Hardware Reference Manual

Page: 226 / 317

UG-707 ADV8005 Hardware Reference Manual
The audio packets use the channel status format conforming to the IEC 60958 specification. When the part is configured to receive an I2S
stream, the information sent in the channel status fields is provided by the following fields:
•
cr_bit
•
a_info
•
clk_acc
•
category_code
•
source_number
•
word_length
•
channel_status
•
i2s_sf
Table 64 provides a mapping between the channel status bit encapsulated in the Audio Sample packets sent across the HDMI link to the
downstream sink and corresponding ADV8005 fields located in the Tx Main register map. Note that the mapping shown in Table 64 is the only
application for I2S modes 0, 1, 2 and 3 set via the i2s_format[1:0] field.
When the part is configured to receive an SPDIF stream, the channel status information is taken from the input SPDIF stream.
audioif_ca[7:0] , TX2 Main Map, Address 0xF476[7:0]
This register is used to set the Speaker Mapping or placement (Audio InfoFrame).
Function
audioif_ca[7:0] Description
00000000 (default) Default value
xxxxxxxx Speaker mapping
cr_bit
, TX2 Main Map, Address 0xF412[5]
This bit is used to set the Channel Status Copyright Information. Refer to the IEC 60958-3 specification.
Function
cr_bit Description
0 (default) Copyright asserted
1 Copyright not asserted
a_info[2:0]
, TX2 Main Map, Address 0xF412[4:2]
This signal is used to set the Channel Status Emphasis information. Refer to the IEC 60958-3 specification.
Function
a_info[2:0] Description
000 (default) 2 audio channels without pre-emphasis
001 2 audio channels with 50/15uS pre-emphasis
010 Reserved (for 2 audio channels with pre-emphasis)
011 Reserved (for 2 audio channels with pre-emphasis)
100-111 Reserved
clk_acc[1:0]
, TX2 Main Map, Address 0xF412[1:0]
This signal is used to set the Channel Status Clock Accuracy information. Refer to the IEC 60958-3 specification.
Function
clk_acc[1:0] Description
00 (default) level II - normal ac/-1000 x 10^-6
01 level I - high ac/- 50 x 10^-6
10 level III - variable pitch shifted clock
11 Reserved
category_code[7:0]
, TX2 Main Map, Address 0xF413[7:0]
This register is used to set the Channel Status Category Code. Refer to the IEC 60958-3 specification.
Function
category_code[7:0] Description
00000000 (default) Default value
xxxxxxxx Channel Status category code
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